namedtuple

I have a question about collections.namedtuple function:

Consider the following example: ... Point = collections.namedtuple('Point', 'x y') p = Point(1,2) print (p.x) ...

It works fine, but I can change first arg of this function: ... Point = collections.namedtuple('Circle', 'x y') p = Point(1,2) print (p.x) ...

It also works. From this I've concluded that the object on the left side of the equality operator defines the name of a "new type", but I don't understand how the link on the return-value can be used as an argument. Can you explain it to me, please?